CN107359712B - Winding Modular Permanent Magnet Motor - Google Patents

Abstract

The present invention provides a winding modular permanent magnet motor including a stator, a rotor and an air gap. The stator consists of a stator core, armature windings, permanent magnets and magnetically conductive small teeth. A large slot is opened inside the stator core, and the slot facing the air gap is installed with a permanent magnet and a magnetically conductive small tooth, and the arc lengths of the permanent magnet and the magnetically conductive small tooth are both τ. The magnetization directions of the permanent magnets are all the same. The positive and negative windings of a single effective coil of each phase are arranged in two adjacent large slots. N coils in the same phase are wound in the adjacent 2N large slots in turn according to the single coil winding method. The teeth between the slots where the in-phase windings are located are all first teeth. The teeth between the different phase windings are the second teeth. The rotor consists of a rotor core and a gap, and the arc length spacing between adjacent rotor cores is 2τ. An air gap is formed between the stator and the rotor. The motor adopts the same-phase winding modular structure design, which simplifies the winding structure, shortens the length of the winding end, improves the winding utilization rate and improves the torque density.

Description

Winding Modular Permanent Magnet Motor

technical field

The invention belongs to the field of motors, and in particular relates to a winding modular permanent magnet motor.

Background technique

Permanent magnet motors based on high-performance permanent magnets have the advantages of high power density and high power factor. However, in the existing permanent magnet synchronous motor, permanent magnets are generally installed on the rotor, and the amount of permanent magnets is large, which significantly increases the cost of the motor. In addition, in some low-speed applications, in order to improve the output torque of the permanent magnet motor, the fractional-slot winding structure with multiple poles and multiple slots is generally used, which makes the winding of this type of motor have a large number of slots, complex winding process, and winding utilization rate. Low. However, the permanent magnet motor with a less-slot structure generally has the problem of large torque ripple.

SUMMARY OF THE INVENTION

In order to solve the problems of large amount of permanent magnets, complex processing and assembly process and large torque ripple in the existing permanent magnet synchronous motor, the invention proposes a winding modular permanent magnet motor.

The concrete technical scheme of the present invention is as follows:

Winding modular permanent magnet motor, which includes stator 1, rotor 2 and air gap 3. The stator is composed of a stator core 1-1, an armature winding 1-2, a permanent magnet 1-3 and a magnetically conductive small tooth 1-4. Large slots 1-1-5 are opened inside the stator core 1-1, and the slots facing the air gap 3 are spaced to install permanent magnets 1-3 and magnetically conductive small teeth 1-4, permanent magnets 1-3 and magnetically conductive small teeth 1- The arc lengths of 4 are both. The magnetization directions of the permanent magnets 1-3 are all the same. The number of blocks of the permanent magnets 1-3 in each slot is Q (Q≥1), the number of blocks of the magnetically conductive small teeth 1-4 is P (P≥0), and the sum of Q and P is an odd number.

The positive and negative windings 1-2-1 of a single effective coil of each phase armature winding are arranged in two adjacent large slots 1-1-5. Different coils 1-2-1 and 1-2-2 (N pieces) of the same phase are wound in the adjacent 2N large slots 1-1-5 in turn according to the single coil winding method. The teeth between the large slots 1-1-5 where the in-phase winding is located are the first teeth 1-1-1. The teeth between the large slots 1-1-5 where the windings of different phases are located are the second teeth 1-1-3. The arc length of the width of the first tooth top 1-1-2 is S1=Kτ (K is an even number), and the arc length of the width of the second tooth top 1-1-4 is S2=(M±2/3)τ( M is an integer).

The rotor consists of a rotor core 2-1 and a gap 2-2, and the arc length of the spacing between adjacent rotor cores is 2. An air gap 3 is formed between the stator and the rotor.

working principle:

The magnetic flux emitted by the permanent magnets 1-3 forms a series magnetic flux closed loop through the air gap 4, the rotor core 2-1, the magnetically conductive small teeth 1-4, and the stator core 1-1, and is connected with the armature winding 1-2 turns. chain. With the movement of the rotor, the relative position of the stator and the rotor changes, and the size of the flux linkage changes, and an induced back EMF is generated in the armature winding 1, and the corresponding current is passed into the armature winding 1, and the motor outputs torque.

In order to realize the modularization of the in-phase winding and ensure that the phases of the multiple coils of each phase winding are the same, set the arc length of the first tooth tip 1-1-2 between the large slots where the in-phase winding is located as S1=Kτ (K is an even number) , and the arc lengths of each large-slot permanent magnet 1-3 and the magnetically conductive small teeth 1-4 are the same, and the sum of the two numbers is an odd number. Therefore, the phase difference between the positive and negative windings of a single coil is guaranteed to be an odd multiple of 180°, and the phase difference between different coils in the same phase is an integer multiple of 360°, that is, the same phase. By setting the arc length of the width of the second tooth tip 1-1-4 between the different-phase windings as S2=(M±2/3)τ (M is an integer), the electrical angle difference between the three-phase windings is 120 °. Therefore, the winding modular structure is realized, the motor winding structure is simple, the modularization is realized, the winding ends are easily reduced, the winding connection process is reduced, and the motor is easy to realize fault tolerance and improve reliability.

The advantages of the present invention are:

1. In the present invention, multiple coils of each phase winding are arranged in adjacent slots, which is conducive to reducing the length of the winding end, and the external wiring of the winding is easy, thereby improving the utilization rate of the winding and the reliability of the motor;

2. In the present invention, the rotor is only a magnetically conductive iron core and related supporting structures, and the rotor structure is simple and reliable.

3. In the present invention, the number of permanent magnets and magnetic conducting cores can be flexibly set in the slot of the stator, so as to meet the performance and cost requirements of magnetic regulation, overload, etc. in different applications;

4. The present invention is easy to realize the modular design and application of each phase, the electromagnetic coupling between each phase is small, it is easy to realize fault-tolerant control, and it is beneficial to improve the reliability of the motor.

Description of drawings

1 is a two-dimensional structural diagram of a winding modular permanent magnet motor in Embodiment 1;

Fig. 2 is the two-dimensional structure schematic diagram of stator;

3 is a schematic diagram of the two-dimensional structure of the stator core and the magnetically conductive small teeth;

Fig. 4 is the two-dimensional structure schematic diagram of rotor;

Fig. 5 is the two-dimensional structure schematic diagram of the winding modular permanent magnet motor of embodiment 2;

In the figure, 1: stator; 2: rotor; 3: air gap; 1-1: stator core; 1-2: armature winding; 1-3: permanent magnet; 1-4: small magnetic teeth; 1-1 -1: first tooth; 1-1-2: first tooth tip; 1-1-3: second tooth; 1-1-4: second tooth tip; 1-1-5: large groove; 2-1: rotor core; 2-2: clearance; 3: air gap.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments

Embodiment 1:

As shown in FIGS. 1 , 2 , 3 and 4 , the winding modular permanent magnet motor of this embodiment includes a stator 1 , a rotor 2 and an air gap 3 . The stator is composed of a stator core 1-1, an armature winding 1-2, a permanent magnet 1-3 and a magnetically conductive small tooth 1-4. Large slots 1-1-5 are opened inside the stator core 1-1, and the slots facing the air gap 3 are spaced to install permanent magnets 1-3 and magnetically conductive small teeth 1-4, permanent magnets 1-3 and magnetically conductive small teeth 1- The arc lengths of 4 are both. The magnetization directions of the permanent magnets 1-3 are all the same. The number of permanent magnets 1-3 in each slot is 2, and the number of magnetically conductive small teeth 1-4 is 1. Between the two permanent magnets 1-3 are magnetically conductive small teeth, and the permanent magnets 1-3 The sum of the number of blocks with the magnetic small teeth 1-4 is an odd number.

The positive and negative windings 1-2-1 of a single effective coil of each phase armature winding are arranged in two adjacent large slots 1-1-5. Different coils 1-2-1 and 1-2-2 (N pieces) of the same phase are wound in the adjacent 2N large slots 1-1-5 in turn according to the single coil winding method. The teeth between the large slots 1-1-5 where the in-phase winding is located are the first teeth 1-1-1. The teeth between the large slots 1-1-5 where the windings of different phases are located are the second teeth 1-1-3. The arc length of the width of the first tooth top 1-1-2 is S1=Kτ (K is selected as 2), and the arc length of the width of the second tooth top 1-1-4 is S2=(M±2/3)τ (M is selected as 1).

The rotor consists of a rotor core 2-1 and a gap 2-2, and the arc length of the spacing between adjacent rotor cores is 2. An air gap 3 is formed between the stator and the rotor.

Embodiment 2:

As shown in FIG. 5 , the difference between this embodiment and Embodiment 1 is that the number of pieces of permanent magnets 1-3 in each slot of the motor is 1 piece, the number of pieces of magnetic conductive small teeth 1-4 is 0 pieces, and The arc length of the width of the addendum 1-1-2 of the first tooth is S1=Kτ (K is selected as 4), and the arc length of the width of the addendum 1-1-4 of the second tooth is S2=(M±2/3)τ( M is selected as 4). The cost of the motor is reduced by reducing the amount of permanent magnets, and the motor assembly process is simpler.

Claims (1)

1. winding modularization magneto, it includes stator (1), rotor (2) and air gap (3): stator by stator core (1-1), Armature winding (1-2), permanent magnet (1-3) and the small tooth of magnetic conduction (1-4) composition；Large trough (1-1-5) is opened inside stator core (1-1), Notch interval installation permanent magnet (1-3) and the small tooth of magnetic conduction (1-4), permanent magnet (1-3) and the small tooth (1- of magnetic conduction towards air gap (3) 4) arc length is τ, and τ is the pole span of motor；The magnetizing direction of permanent magnet (1-3) is all the same；Each notch permanent magnet (1-3) Block number is Q, and Q >=1, the block number of the small tooth of magnetic conduction (1-4) is P, P >=0, and the sum of Q and P are odd number；Every phase armature winding is individually effective The positive and negative winding (1-2-1) of coil is arranged in two adjacent large troughs (1-1-5), and N number of coil with phase is according to single coil Winding method is successively wound in adjacent 2N large trough (1-1-5)；It is equal with the tooth between the large trough (1-1-5) where phase winding For the first tooth (1-1-1), the tooth between large trough (1-1-5) where different phase windings is the second tooth (1-1-2), the first tooth (1- The arc length of tooth top (1-1-2) width 1-1) is S1=K τ, and K is even number, and the arc length of tooth top (1-1-4) width of the second tooth is S2 τ, M are integer for=(M ± 2/3)；Rotor is made of rotor core (2-1) and gap (2-2), spacing between adjacent rotor iron core Arc length is 2 τ；Air gap (3) are formed between stator and rotor.